Auxiliary wheel arrangement of bicycle

Abstract

The auxiliary wheel arrangement of bicycle of this invention comprises arms extending sideways from the bicycle body to be vertically displaceable, a means for imparting to the arms a torque required for lowering the tips of these arms and auxiliary wheels attached to the tips of the arms, and is used attached to e.g. the rear wheel of a bicycle on both sides thereof. A bicycle equipped with the auxiliary wheel arrangement of the present invention, which can have its body swayed in either lateral direction, is prevented from tilting of the body when it is parked or stopped, being thus kept upright then without fail.

What is claimed is: 
     
       1. An auxiliary wheel arrangement for bicycle comprising: an arm extending to one side from a bicycle body adjacent a rear wheel of said bicycle to be vertically displaceable;   a means for imparting a pivotal displacement to said arm for lowering the tip thereof; and   an auxiliary wheel attached to the tip of said arm, said auxiliary wheel having a static frictional resistance against the ground which prevents sliding of the auxiliary wheel relative to the ground in a direction transverse to said bicycle when said bicycle is stationary and having a rolling frictional resistance against the ground which allow sliding of said auxiliary wheel relative to the ground in a direction transverse to said bicycle when said bicycle is moving.   
     
     
       2. An auxiliary wheel arrangement for bicycle as recited in claim 1, wherein there are further provided a supporting member with means for mounting to the bicycle body and said arm is pivoted on said supporting member to be vertically displaceable. 
     
     
       3. An auxiliary wheel arrangement for bicycle as recited in claim 2, wherein a pivotal displacement is imparted to said arm by means of a spring provided between said supporting member and said arm. 
     
     
       4. An auxiliary wheel arrangement for bicycle as recited in claim 3, wherein impartation of said pivotal displacement to said arm is done by means of a coil spring used as pulling spring. 
     
     
       5. An auxiliary wheel arrangement for bicycle as recited in claim 4, wherein said supporting member is substantially "J"-shaped has provided at one end thereof a means for securing it to the bicycle body and a narrow and long vertical guide frame at the other end, one end of said arm is pivoted on said supporting member close to said securing means and the other, outer end portion thereof is inserted into said guide frame for said arm to be held substantially level, there is set said coil spring stretched between a low point of said supporting member and said arm and there is provided an adjusting bolt under said guide frame for limiting the extent of the downward rotation (displacement) of said arm. 
     
     
       6. An auxiliary wheel arrangement for bicycle as recited in claim 3, wherein impartation of said pivotal displacement to said arm is done by means of said coil spring used as compression spring. 
     
     
       7. An auxiliary wheel arrangement for bicycle as recited in claim 6, wherein said supporting member is substantially "J"-shaped has provided at one end thereof a means for securing it to the bicycle body and a narrow and long vertical guide frame at the other end, one end of said arm is pivoted on said supporting member close to said securing means and the other, outer end portion thereof is inserted into said guide frame for said arm to be held substantially level, there is set said coil spring compressed between a high point of said guide frame and said arm and there are provided adjusting bolts above and below said guide frame for limiting the extents of upward and downward rotation. 
     
     
       8. An auxiliary wheel arrangement for bicycle as recited in claim 2, wherein the dead weight of said auxiliary wheel is used to impart said pivotal displacement to said arm. 
     
     
       9. An auxiliary wheel arrangement for bicycle as recited in claim 2, wherein under said arm and on said support member there is provided an adjusting bolt for limiting the extent of downward rotation thereof. 
     
     
       10. An auxiliary wheel arrangement for bicycle as recited in claim 2, wherein above said arm and on said support member there is provided an adjusting bolt for limiting the extent of upward displacement thereof. 
     
     
       11. An auxiliary wheel arrangement for bicycle as recited in claim 1, wherein one end of said arm is displaceably and directly attached to the bicycle body.